Math Riddle

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The number is 8. Because when you add one way, it equals the result of the subtraction in reverse. 🎉

josearaujo
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8. Now how will we ever know if we are right?

andreainpa
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8. Took me forever, but i got it just through trial and error.

colobolo
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Add 8 to smaller no to get opposite answer

themarkbishop
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What I want to know is not the missing number but how did he know to fill in all the other numbers?

mmartin